Seeking professional consulting service

I am interested in purchasing 1 of 4 fixer properties, and seeking a good contractor willing to walk me through each and provide a professional assessment of the work required. My primary requirement: objectivity, however incomplete (i,e due to hidden problems) and a ballpark figures for each issue. Any suggestions? I do expect an hourly consulting fee, have experience restoring an old house, and understand that construction services in this city are expensive.